Dental handpiece
Patent 3942392 Issued on March 9, 1976. Estimated Expiration Date: 
March 9, 1993. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
March 9, 1993. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 3430521 3439422 3832088 InventorsAssigneeApplicationNo. 477803 filed on 06/10/1974US Classes:433/129, Including axially movable collect to cam fingers415/904, TOOL DRIVE TURBINE (E.G., DENTAL DRILL, ETC.)433/105, Including clutch or variable transmission433/132Rotary fluid turbineExaminersPrimary: Scott, SamuelAssistant: McKenzie, Frank H. Jr. Attorney, Agent or FirmAbstractA straight dental handpiece comprising a pair of telescoping housing barrels which can swivel relative each other, one containing a chuck and the other containing a vane type air motor. A change speed transmission is entrained between the motor and the chuck, such transmission being adjustable to change speeds by relative endwise movement of the barrels. Opening and closing of the chuck is accomplished by relative rotation thereof a limited amount. A reversing valve, also on the handpiece, is movable into either of two positions to apply air under pressure to either of two passages to drive the motor in one direction or the other. | |
